Revert `mount_path` parameter from `FastMCP` (#1881) #126

Job	Run time
checks / readme-snippets	12s
checks / pre-commit	33s
checks / test (3.10, locked, windows-latest)	2m 11s
checks / test (3.10, lowest-direct, windows-latest)	2m 19s
checks / test (3.11, lowest-direct, ubuntu-latest)	46s
checks / test (3.11, lowest-direct, windows-latest)	2m 27s
checks / test (3.10, locked, ubuntu-latest)	47s
checks / test (3.10, lowest-direct, ubuntu-latest)	46s
checks / test (3.13, locked, windows-latest)	2m 22s
checks / test (3.14, locked, ubuntu-latest)	2m 19s
checks / test (3.12, locked, windows-latest)	3m 44s
checks / test (3.11, locked, ubuntu-latest)	46s
checks / test (3.11, locked, windows-latest)	2m 29s
checks / test (3.13, lowest-direct, ubuntu-latest)	44s
checks / test (3.13, locked, ubuntu-latest)	44s
checks / test (3.13, lowest-direct, windows-latest)	5m 13s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 7s
checks / test (3.14, lowest-direct, windows-latest)	2m 16s
checks / test (3.12, locked, ubuntu-latest)	47s
checks / test (3.12, lowest-direct, windows-latest)	4m 30s
checks / test (3.14, locked, windows-latest)	3m 48s
checks / test (3.12, lowest-direct, ubuntu-latest)	50s
all-green	2s
	41m 42s

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